Crystal structure and improved dielectric, magnetic, ferroelectric and magneto-electric properties of xCoFe2O4−(1−x)BaTiO3 multiferroic composites

Abstract

Multiferroic composites having composition xCoFe2O4−(1−x)BaTiO3 (x = 0.10, 0.30, 0.50) were synthesized. XRD patterns of samples confirmed that the peaks of both ferroelectric (tetragonal symmetry) and ferrite (cubic symmetry) phases existed simultaneously. Rietveld refinement confirmed the existence of both phases with tetragonal symmetry having P4mm space group and cubic symmetry with Fd3m space group. Grain sizes of the composites have been calculated using FESEM. The frequency and temperature dependence of dielectric constant (ɛ′) and dissipation factor (tanδ) have been studied. In the lower frequencies, ɛ′ and tanδ show dispersion behaviour, and in higher frequencies, it becomes constant for all composites. M–H loops depict soft magnetic behaviour with a maximum value of magnetic moment 1.618 μB for 0.50BaTiO3–0.50CoFe2O4sample. P–E loops show that remanent polarization and coercive field decrease with increase in ferrite content. The maximum value of ME coefficient (α ~ 165.32 μV/cmOe) is obtained for 0.10CFO–0.90BT composite.